princess, although it's been a while since i was in that situation, I'm almost positive that if, you speak with your master, he may very well be the one to offer a suggestion, that could be to your liking. It's not unheard of to have time off during your cycle, however, it's also not such a taboo to perform during that time. Remember, communication is important for each of you to understand one anothers, needs, wants, and desires. Talk to your master about your limits...
xx